Pump for refrigerating apparatus



Jan. 20, 1931. o. M. SUMMERS PUMP FOR REFRIGERATING APPARATUS Filed Feb.29, 1928 M w v r 2 fl =g c w, M2 1% a i/ V 2.5. %W

. INVENTOR.

A TTORNEYS.

which can lee-manufacturedwithout ent invention will-be apparent fromthe follorwing olescription reference-being hadto the Patented Jan. 20,1 931 e ea s armeemame er eeeI Application filed February'29, 1;)281'Serial IyTo. 257,818.

more particularly the outlet Valves used for cempiessors and the'l ike;I a

It-is one of the ;ob]eot's" ofthe'i-nventlonto provide an improved va'lveplate which is formed of asinglestamped-member.-

"ltis another object oftheintention-dosimplif-y the construction and-toreduce the {cost of'manufactrlreof the;valve plate.

It-is a further object of the invention to withamini-mum ofrexpense anddifficulty and grinding or special finishing operations.

"IVith-these objects in view the invention contemplates providingarr-improved valve plate which is stamped or punched out of asingle-sheet of metal in the mannerhereinde scribed;v

. Further-obj ec'tsand advantages o f-the-pres accompanying drawing,wherein a preferred form of the present invention "is clearly shown.

;I n thedrawingszprovedvalve platexqf the invention mounted.

inposition .inacompress-or -'F-ig.; 2 r-shows a- :top viewiof the valveplate' itselfpand Listen-enlarged cross-section of a sectionthrough thecompressor and the-valveiplatea J In theicon'striictionzof compressors,particularly ofithetypelus'ed in mechanical nefri'gera-tons, it iscustomary .to mount thei-outlet valvesathereof son .pl-ates'which areclamped :hetweenthe'head ofkthe cylinder and the bodyjqthereof...Suchfyalve plates are generally. imade. ofcast'iron and it is a alwaysnecese sany lto machinezithe sunfaces of such plates Very accurately,particularlyiatqthe: points. gwhere the valveszare mounted-and atgtheportionsof the plate clamped between the head and the body'ofsthecylincler. Such machining operations are .relatively: expensive 7 and itan object of the present. invention QQ;toiqbgviatethesnecessityforsuchwork; p v

- of-alange sheet; Thissheet ShOLtllflIilVfitWO 7 body and-=;l1e-ad.Thisouterprojectingsem Another-problem confrontingthe-designers v ofcompressors; is thedissipation of heet qoaz mnom r .DAYTON, .0310, ACOBPORAHONQF DELAWA E caused by the compression of th'exgas? In 1general this has been taken care of by the provision of-fins onthecompressor-body and head UndenheaVy loads, the --fins" have not alwaysbeensu -fiicient and the'compressor'has become hot around thevalVepl atediie-to=h=igh head pressures and hot-oil; l his *heat, pressure and oilhas sometimes affected thex gaskets around the val-veiplate. 7 provide avalve plate which can be installed -Tghe improved valve plate of thisinvention isqnadepfa piece of sheet steel of suitable, thicknesswhiohispunched or stamped out plane-surfaces-so that the necessity for machining the-sameis obviated. The punching. orlstam ping operationisneces'sarily made by 1 a very powerful maohine." The force with" whichthe valve plate is separated from the sheet of steeLea-uses' adeformation about the edge of the va lVe pl-ate; One of the chiefobjects of" this invention therefore consists in so punching theyal-veplate out ofia sheet: of" steel that the portions thereof whichmaybestrainedor deformed during the punching,

f c operation lie oiitsideof the l-imits-jof the-sar l showsa View insection of the imface constituting the Valve-retaining-portion andthepontionclampedbetween th'e cylinder tion of materialeonsti-tutes aheat radiating test place of 'the compressor duringoperation. .7Beferriingiin detai l -to -the drawings, it willbev-obseriledfromlligs.'lgand .8 thatthe valvefin projecting from what is normally the hotplateconsists of a sheet metal 'memb'er 10 V which-,as shown gin jFigz; 2,,isgstamped out in. the form of a su hstantiafly oval plate large Ienough tor cov er the,cylinder ofacompressor. Intlie drawingsthecompressor, is TGPIEBSBDtBd-V V as having two cylind ers, 1 1" and 12:in which 7' pistons 18" 14 operate respectively. Howeyen itlis obviousthat the plate ofjthe n el' ii app ica l to .s ge ylmde 1" to aplurality ofcylinders' and that it may have any shapecorresponding tosuch cylinders, Thelate may be of any suitable thicknessyaltho by' Wa'yx ().fillustration- Z inch may i be considered preferred dimension.This 7 thickness oflA inch i's'approziimately half'of the safestthickness allowable with a cast iron plate due to the possibility ofblow holes in the cast iron.

A head member 15 isprovided which is clamped to the cylinder bodies bymeans of suitable bolts 16 which pass through the head 15, theextremityofthe valve plate 10-and into the threaded portion 17 of the cylinders.The stressed or deformed portion of the plate lOextends somewhat beyondthe walls of-thecylinder and forms a projecting fin- 18 which aids inradiating heat in a manner analogous; to the fins 27 on the cylinderbody. *"This'pro jecting fin 18 is integral with interiorof the platelocated in the hottest place o'f'the conipressor. The compression of thegas and the hot oil createquite ailarg'e amount of heaton the plate justabove the pistons and the fin 18 allows a direct conduction to theoutside air. This fin projects outwardly from the/exterior of thecylinder body and may slant down-- wardly as shown in Figs, 1 and 3.This downwardly slanting portion represents the amount of deformationproduced during the.

stamping ofthe valve plate from a sheet of metal and it is the purposeof the invention;

to mount the valve plate in such a manner that'this deformed or stressedportion lies outside of the compressor itself so that only the plane andunstressed portions of the plate itself will come within theconfines ofthe cylinder. The amount of such deformation depends of course upon thenature of the steel used and the condition of the dies employed Itsexact degree of curvature is of no consequence, but as shown in Fig.3 bythe dotted line 19 which is a prolongation of the top plane surface ofthe valve plate the deformed portion maylextendoutwardly to aconsiderable extent. j a U The valve plate of the invention as'beforedescribed, is clamped between the cylinder head 15 and the body portions11and12of the cylinder. Suitable gaskets 20 are disposed between thehead and the plate and the cylinder body and plate. to prevent leakage.

The valve plate is provided withholes21 which are drilled therein toaccommodate the bolts 16 which hold the cylinder head 7 and valve inassembled relation and is also provided with valve seats 24 formed byunder cutting a recess 23 in the top surface of the valve plate andleaving projecting a seat 24 for the valve which should present plateand improper seating of the] valve.- The valve structure constitutingvalve reed 2 and spring -25, maybeheld to; the valve By means of theimproved valve plate of the invention considerable economy may beeffected in the construction of compressors. Not only .isthe necessityfor costly machining operationsobviated but by using sheet steel athinner plate may be used than is the case of cast iron. While the valveplate.

accordi'ng to the invention is more easily and 3 economically'manufactured than the usual valve plate, yet one of its most importantadvantages isthefa'ct that it allows a direct conduction of heat fromone of the hottest places in th e'interior of the compressor.

While the ,forms of embodiment of' the invention as .herein disclosedconstitute a; preferred formit is to-be understood that other formsmight beadopted, all coming within the scope of the claims which follow.

@Whatis claimed is as follows:

A Valve Plate for aycomPIessQI or the like comprising a flat sheetmetal. plate stamped out of a sheet of metal and having valve seatsformedithereon arrangedtoflbe covered by valves and being shapedito bemounted between the cylinder head and the cylinderbody of a compressorand having :the zone of deformation caused ;by said.

stamping" operation located outside of I the effective valve plate areaand constituting a heat radiating fin. o

2, In a compressor, a stamped sheetvmetalplate arrangedtobe interposedbetween sur faces having the same shape as the opposed. sides of theplate, saidplate having its zone of deformation which is caused by thestamp; ing thereof, disposed'beyond the engaging area of the plate andsuch surfaces and con-4, stituting aheat radiating-fin. j Y a 7 H '3. Ina compressor orthe like, in combina-a tion, a cylinder, a head for saidcylinder and a-.valv,e'plate clamped between said headand said cylinder,said valve-plate beingpunched out of a single sheet:of sheet metal andhave ingvits zone ofdeformation extending utside of the efiective valveplate area-clamped between. said head andsaidcylinder,,said outside zoneconstitutinga fintforthe conduction of heat from said cylinder andhead); 4.:-ln a compressor, in combination, a cylinder,-;a headforsaidcylindena valve plate: intermediate said cylinder andsaidheady meansforuniting saidlread, said plate Land said cylinder ,into' assembledrelation, said means being located adjacent thecircumference -of said.cylinder, said valve plate"hav'- ing a peri'pheral zone'which. is aptto be deformed extending outside 1 ofathe valve plate area included.between said head and said cylinder and arranged' to-radiate -heat fromsaidcylinder'andhead. i

5. In a'compressor, in combinationfa cylinderbody,;a head forsaid'cylinderyavalve plate intermediate said cylinder and said head,means for uniting said head, said plate and said cylinder into assembledrelation,

said means being located adjacent the circumference of said cylinder,said valve plate having a peripheral zone of deformation extendingoutside of the valve plate. area included between said head and saidcylinder, said deformed zone extending substantially beyond saidcylinder and serving as a. heat radiating fin.

6. In combination, a cylinder, a head for said cylinder, a valve plateintermediate said head and cylinder, said valve plate being stamped fromsheet material and having a portion of its peripheral zone ofdeformation projecting beyond the periphery of said head and cylinder.

7. In combination, a cylinder, a head for said cylinder, a flat valveplate interposed between said cylinder and said head, said cylinder andsaid head being provided with fiat surfaces engaging the fiat surfacesof the valve plate, said valve plate being stamped out of a sheet ofmetal and having its zone of deformation due tosaid stamping operationdisposed beyond the engaging surfaces of said head and said cylinder.

8. In a compressor having a cylinder, means for dissipating heat ofcompression including a thermally conducting plate extending from withinthe cylinder outside of the cylinder and remote from parts adjacent theplate. 7

9. In a compressor in combination, a'cylinder, a discharge chamber and apartition separating the cylinder and chamber, said partition having apassage therethrough and being of metal of high thermal conductivity andhaving a portion extending outside of the cylinder and remote from partsadjacent the plate.

In testimony whereof I hereto affix my signature.

oT'ro M. SUMMERS.

